import java.util.ArrayList;
import java.util.List;

public class Test{
    public  static List<Character> fun(String str1,String str2){
        List<Character> list=new ArrayList<>();
        for (int i = 0; i < str1.length(); i++) {
            char ch=str1.charAt(i);
            if(!str2.contains(ch+"")){
                list.add(ch);
            }
        }
        return list;
    }
    public static void main(String[] args) {
        List<Character> list=fun("welcome to cvte","cvte");
        for (char ch: list) {
            System.out.print(ch);
        }
    }
}
